[texworks] Possible bug in TeXworks previewer

[Philip Taylor (Hellenic Institute)]

TeXworks (version and environment as per preceding recent possible bug 
reports) routinely displays "actual size" incorrectly when a document is 
first previewed.

If, however, one uses Edit/Preferences/Preview to (a) /increase /the 
screen resolution by one notch — e.g., from 81.40 dpi to 82.40 dpi — and 
clicks on [OK], and (b) to /decrease /the screen resolution by one notch 
and clicks on [OK], the document then renders at actual size — also true 
if the steps are taken in the reverse order.  Found to be the case for 
two recent projects, the smaller of which was typesetting a score card 
with dimensions 8cm x 21cm (attached, in case relevant).

-- 
/Philip Taylor/

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% !TeX Program=XeTeX

\pdfpagewidth = 8 cm
\pdfpageheight = 21 cm

\hsize = 18 pc
\vsize = 47.5 pc

\advance \hoffset by 0,5 \dimexpr \pdfpagewidth - \hsize \relax
\advance \voffset by 0,5 \dimexpr \pdfpageheight - \vsize \relax

\output = {\advance \hoffset by -1 in \advance \voffset by -1 in \shipout \box 255 \relax}

\parindent = 0 pt
\parskip = 0 pt

\font \fa = "Arial Black" at 17,5 pt
\font \fb = "Arial"
\font \fc = "Arial":color=999999
\fb

\newdimen \units
\units = 0,98 ex

\def \stretch {\tabskip = 0 pt plus 0,2 \hsize \relax}
\def \nostretch {\tabskip = 0 pt \relax}

\topskip = 12 pt
\centerline {\fa BODMIN BOWLS CLUB}

\vfill
\vbox 
\bgroup
	\fc
	\baselineskip = 4 ex
	\special {color push rgb 0.8 0.8 0.8}
	\line {\kern 3 em Date: \hrulefill \kern 3 em}
	\line {\kern 3 em Time: \hrulefill \kern 3 em}
	\line {\kern 3 em Match: \hrulefill \kern 3 em}
	\special {color pop}
\egroup
\vfill
\nostretch

\newtoks \ends 
\newcount \endscount \endscount = 0

\def \addtoends #1{\ends = \expandafter {\the \ends #1}}
\def \addleftnumber #1{\addtoends {\Line {}{}{\Left {#1}}{}{}}}
\def \addrightnumber #1{\addtoends {\Line {}{}{\Right {#1}}{}{}}}
\def \addleft {\expandafter \expandafter \expandafter \addleftnumber \expandafter {\the \endscount}}
\def \addright {\expandafter \expandafter \expandafter \addrightnumber \expandafter {\the \endscount}}

\loop
	\advance \endscount by 1
	\ifodd \endscount 
		\ifnum \endscount = 1 \addtoends \Hrule \fi
		\addleft
	\else
		\addright
	\fi
	\addtoends \Hrule
\ifnum \endscount < 21
\repeat

\def \column {\hss ##\hss}
\def \vhdrule {\vrule height 2,5 \units depth 0,5 \units}
\def \Hrule {\noalign {\vrule height 0,2 pt depth 0,2 pt width \hsize}}
\def \Vrule {##\vhdrule}
\def \Line #1#2#3#4#5{&#1&&#2&&#3&&#4&&#5&\cr}
\def \Left #1{\hbox to 3 em { #1\hss}}
\def \Right #1{\hbox to 3 em {\hss #1 }}
\def \Centered #1{\noalign {\line {\vhdrule width 0 pt \hrulefill \quad #1\quad \hrulefill \vhdrule width 0 pt }}}

\offinterlineskip
\halign to \hsize
\bgroup
	\vrule \span \stretch #&
		 \span \column & \span \Vrule & \span \column &\span \Vrule \span \nostretch & \span \column &\span \Vrule \span \stretch & \span \column &\span \Vrule & \span \column &
			 #\vrule \span \nostretch \cr
	 \Centered 1
	 \Centered 2
	 \Centered 3
	 \Centered 4
	 \noalign {\kern 3 ex}
	\the \ends
\egroup
\eject
\end